<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let obj ={
            name:'张三',
            age: 18,
            gender:'男',
        }
        for(let k in obj){
            console.log(k);
            console.log(obj.name);
            console.log(obj['name']);
            console.log(obj[k]);
            
            
        }
    </script>
</body>
</html>